Abstract
The title compound, (2,2'-bi-pyridine-κ(2) N,N')tri-iodido-meth-yltin(IV), [Sn(CH3)I3(C10H8N2)], crystallizing in the non-centrosymmetric ortho-rhom-bic space group Pca21 as an inversion twin, represents one of the few structurally characterized coordination compounds of an organotin(IV) trihalide with 2,2'-biypridine. Its distorted octa-hedral geometry shows a meridional arrangement of the I atoms and the methyl group is in-plane with the five-membered chelate ring. Asymmetric bonding of the biypridine ligand to the tin(IV) atom is reflected by different Sn-N bond lengths [2.268 (4) Å versus 2.293 (4) Å] and caused by the static trans effect of the methyl group. Sn-I bond lengths show some differences with respect to their orientation to the methyl group or the bi-pyridine ligand, respectively. Angular distortions in the coordination sphere of the Sn(IV) atom mainly arise from the large I atoms. Distortion of the 2,2'-bi-pyridine ligand as a result of its coordination to the Sn(IV) atom are described by the twisting angle of 2.5 (2)° between the least-squares planes of the two pyridine rings, as well as by the angle of 6.2 (2)° between the two lines through the pyridine-connecting C atoms and the para-orientated C atoms. Directional inter-molecular inter-actions are restricted to weak I⋯H van der Waals contacts.
Highlights
The title compound, (2,20 -bipyridine-2N,N0 )triiodidomethyltin(IV), [Sn(CH3)I3(C10H8N2)], crystallizing in the non-centrosymmetric orthorhombic space group Pca21 as an inversion twin, represents one of the few structurally characterized coordination compounds of an organotin(IV) trihalide with
Its distorted octahedral geometry shows a meridional arrangement of the I atoms and the methyl group is in-plane with the five-membered chelate ring
Sn—I bond lengths show some differences with respect to their orientation to the methyl group or the bipyridine ligand, respectively
Summary
Lewis acidity among the organotin(IV) halides, only a few complexes have been prepared and even fewer have been structurally characterized, in contrast to the situation in case of diorganotin(IV) dihalides. Lewis bases with O or N as coordination donors, whereas corresponding bidentate ligands are inadequately represented. There are only five coordination compounds of monoorganotin(IV) trihalides with bidentate N,N-chelating ligands listed in the Cambridge Crystallographic Database (Version 5.36, last update May 2015; Groom & Allen, 2014). E72, 17–20 doi:10.1107/S2056989015022975 research communications substituent in relation to the plane of the ligand (in-plane or perpendicular) while the three halide atoms adopt a meridional or facial orientation. The majority of all complexes investigated exhibit a meridional arrangement of the halide atoms, only 3 features a facial one.
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